机票预订信息管理系统的设计用于查询，预定，退订等功能 -tickets system select

树结点添加，删除，更改及查询树结点信息，总共三层结点，还可以设置结点索引图标，修改树形背景信息，功能非常强大-Tree node to add, delete, change and query tree node information, a total of three nodes, you can also set the node index icon, modify tree background information, the function is very powerful